JP2000054788A - Laying method for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laying method for pipes through which construction man-days can be reduced by leading new pipes in a hole simultaneously with excavation and propulsion and a reactive force from the earth generated during the drawing-in work can be replaced with a propulsion. SOLUTION: In this method, a propulsion means 4 is actuated from the ground level to the underground and a PE pipe corresponding to a new pipe is inserted in a propulsion hole formed by the propulsion means. One end of the PE pipe 1 wound on the ground is integrally joined at the backward position of the propulsion means 4, in a propulsion head 5 having a built-in drive source for the thrusting means 4, and the pipe is driver by propulsion while holding a part of the PE pipe 1. In this way, the PE pipe 1 is led into the underground simultaneously with the propulsion of the propulsion means 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe laying method for a newly laid supply pipe or the like.

[0002]

2. Description of the Related Art Conventionally, a supply pipe has been laid as a conduit for supplying gas from a main pipe buried under a road to a customer in a private area.

[0003] One end in the laying direction is connected to a supply pipe via a service tee attached to a branch opening formed in the main pipe, and the other end in the laying direction is connected to a meter stand at the customer's destination. It has become. When constructing new supply pipes, excavate starting and reaching stands that open to the ground surface at the place where the main pipe is buried and at the place where connection with the meter stand can be made in private land. The work of inserting the supply pipe between the standing pipes and connecting one end in the laying direction of the supply pipe to the service tee attached to the branch of the main pipe, and connecting the other end in the laying direction to the meter standing pipe is performed. I have. In order to newly install a supply pipe, a drill rod such as a round steel rod or a screw auger that excavates while forming a hole for inserting the supply pipe, and a hydraulic engine as a drive source for propelling and pulling back the excavation rod, Internal combustion engine,
An excavation propulsion device including a propulsion device main body including any of an air motor and an electric motor is prepared.

In recent years, in order to prevent the supply pipe from being damaged by an external force generated at the time of a disaster such as an earthquake, a polyethylene pipe (PE pipe) or the like, which is more flexible than a conventionally used steel pipe, has been used. Is being used. The above-mentioned work is performed when newly installing a supply pipe including the case where such a PE pipe is laid.

[0005]

However, in the above-mentioned conventional laying work, there is a possibility that the work time required for the laying work is lengthened. In other words, since the excavation propulsion device is provided with the various devices as described above, the work required for installation in a narrow shaft and transportation to the shaft is increased. Also, since the propulsion rod is extended according to the propulsion length, the extension work and the work for removing and recovering the extension are performed while increasing the propulsion time in proportion to the extension of the propulsion distance. Increases the working time. In addition, since the propulsion operation of the propulsion rod, the extension operation, and the rod collection operation are performed within the space of the narrow space, the labor burden on the operator increases. In other words, shafts are formed under the restriction that the ground excavation width cannot be increased unnecessarily, and if the excavation width is close to the length of the rod to be added or recovered, it will be necessary to add these , The workability in the shaft is deteriorated.

The present invention has been made in view of the above-mentioned problems in the conventional pipe laying method, and has as its object to provide a pipe laying method capable of shortening the working time by reducing the number of working steps. In particular, to provide a laying method that can reduce the number of processes by pulling in new pipes at the same time as excavation promotion and replace the reaction force from the soil generated when pulling in new pipes with propulsion. It is in.

[0007]

In order to achieve this object, the invention according to claim 1 is to promote a digging means from the surface of the ground to the ground, and to form a new pipe material in a propulsion hole formed by the digging means. A pipe laying method for inserting a corresponding PE pipe, wherein a propulsion head equipped with a drive source of the excavating means is integrated with one end of a PE pipe fitted on the ground behind the excavating means, It is characterized in that the PE pipe is drawn into the ground simultaneously with the propulsion of the excavating means by propulsion driving while holding a part of the PE pipe.

According to a second aspect of the present invention, in the pipe laying method according to the first aspect, the PE pipe is gripped by a rotatable payout roller provided on a base installed in a stationary state. By rotating in the direction following the propulsion direction, the propulsion reaction force from the soil acting on the excavation means is received and propelled.

According to a third aspect of the present invention, in the pipe laying method according to the second aspect, the base provided with the feed-out roller is installed on a road surface or a ground in a private area, and is parallel to the ground at the installation location. The state can be changed from a state to a right angle, and the propulsion angle of the PE tube is adjusted.

[0010]

According to the first aspect of the present invention, one end of the PE pipe corresponding to a new pipe material worn on the ground is integrated with the propulsion head and driven for propulsion. It can function as a rod. As a result, the propulsion head can be propelled by the PE pipe that is sequentially fed from the wear position, so that the excavation can be performed in conjunction with the propulsion of the propulsion head without performing the work of adding and collecting rods, which was conventionally performed. At the same time, the PE tube can be pulled in.

According to the second aspect of the present invention, since the reaction force from the soil generated when the propulsion head is propelled is received by the feeding roller for feeding out a new pipe material, the return when the PE pipe is used as the propulsion rod is suppressed. The propulsion operation by the excavation means can be performed smoothly.

According to the third aspect of the present invention, the angle of the base provided with the feed-out roller can be adjusted from a state parallel to the ground to a right angle on the road surface or the ground in a private area. The PE pipe can be advanced at an angle, and the PE pipe can be laid without cutting the ground.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a schematic view for explaining a laid state of a supply pipe 1 corresponding to a new pipe material in which a PE pipe is used. In FIG. 1, a main pipe 2 is buried on a lower surface of a road. I have. In a private area near the road, there is a meter stand (not shown) drawn into the house. An excavation propulsion device 3, which will be described later, is installed near the meter standing pipe.
On the base of the excavation propulsion device 3, a part of the supply pipe 1 fitted to a pulley (not shown) installed on the ground at a position adjacent to the excavation propulsion device 3 is extended and mounted. .

As shown in FIG. 2, the excavation propulsion device 3 comprises a propulsion head 5A having a propulsion unit base 3A, a screw auger 4 corresponding to excavation means, and a hydraulic motor serving as a drive source for the screw auger 4. The excavation propulsion device 3 is further provided with the above-mentioned supply pipe 1 for driving the propulsion of the propulsion head 5. The supply pipe 1 is fitted on a reel (not shown) arranged near the excavation propulsion device 3, and one end of the supply pipe 1 is fed out.

The propulsion unit base 3A includes a support base 3B having an anchor 3A1 piercable into the ground on the bottom surface, and a supply pipe feeder 3C swingably supported by the support base 3B. And The supply pipe feeder 3C can swing by expansion and contraction of a cylinder 3D (see FIG. 1) disposed between the supply pipe feeder 3B and the support base 3B.
In the case of the present embodiment, the angle is set from 0 degrees, which is parallel to the ground corresponding to the contraction of the cylinder 3D, to 90 degrees relative to the ground corresponding to the extension of the cylinder 3D. The supply pipe feeder 3C is provided with a pair of pinwheel-shaped propulsion drive members 6 whose opposing distance is adjustable,
The propulsion drive member 6 is configured to be rotationally driven by a rotary drive hydraulic motor (not shown) provided in the supply pipe feed section 3C. When the supply pipe 1 is inserted into the opposing peripheral surface, the propulsion drive member 6 rotates the frictionally contacting rotation of the supply pipe 1 so that the supply pipe 1 is fed in the propulsion direction (the direction indicated by the arrow in FIG. 2). The rotation amount at the time of feeding is adjusted by a control unit 7 described later. In addition, the propulsion drive member 6
Has a configuration in which the facing distance can be adjusted. In order to perform the facing distance adjustment, the supporting member of the rotational drive hydraulic motor of the propulsion driving member 6 can be moved in the direction facing the supporting member. A possible hydraulic cylinder (for convenience, a cylinder D1 for a propulsion drive member in FIG. 3) is provided.

On the other hand, the propulsion head 5 moves in the propulsion direction (FIG. 2).
Middle, direction indicated by the arrow) The front side has a tapered cone shape,
An opening for inserting and supporting the screw auger 4 is formed at the tip thereof. On the rear side of the propulsion head 5 in the propulsion direction, a chuck 8 using a collet is provided. The chuck 8 can grip the supply pipe 1 and integrate it with the propulsion head 5. 2, a hydraulic motor (for convenience, referred to as a screw auger hydraulic motor M1 in FIG. 3) provided in the propulsion head 5 is extended from an oil supply unit 9 (see FIG. 1) installed on the ground. Hydraulic pipe 10, 10 '
The hydraulic pipes 10 and 10 ′ are inserted into the supply pipe 1 and reach the hydraulic motor M1. Regarding the hydraulic pipe, although not shown, other than the hydraulic motor M1 (10, 10 ') described above, a hydraulic motor for rotationally driving the propulsion driving member 6 (for convenience, the hydraulic motor M2 for the propulsion driving member in FIG. To). The screw auger 4 has a shape in which the outer diameter of the screw blade is gradually increased from the tip toward the propulsion head 5, so that the resistance at the beginning of excavation can be reduced.

The configuration of the control unit 7 is shown in FIG. In FIG. 3, a main part of the control unit 7 is constituted by a microcomputer, and a start switch 11 for starting / stopping, a pressure sensor 12, a diameter set key switch 13 are provided on an input side via an I / O interface (not shown). The position detection sensor 14 is connected to the output side. On the output side, the hydraulic motor M1 for driving the screw auger, the hydraulic motor M2 for the propulsion driving member, the driving direction switching valve for the propulsion driving member cylinder D1 and the cylinder 3D (for convenience, FIG. Are referred to as cylinders using 3D). The start switch 11 is a switch for instructing rotation start and emergency stop of the screw auger 4 included in the propulsion head 5, and a pressure sensor 12 is provided on a shaft provided on the screw auger 4 for detecting a reaction force from the soil. A strain gauge for detecting the strain in the direction is used, the aperture set key switch 13 is a key switch for inputting the aperture of the supply pipe 1 to be retracted, and the position sensor 14 is provided with a screw auger (not shown) from the ground. In order to detect the position of the propulsion head 4, a receiver that receives a signal from a transmitter (not shown) mounted on the propulsion head 5 is used.

When the power is turned on and the aperture of the supply pipe 1 is input by operating the aperture set key switch 13, the control section 7 drives the propulsion drive so as to set the facing distance of the propulsion drive member 6 according to the aperture. The operation of the member cylinder D1 is controlled, and when the start switch 11 is operated, the screw auger hydraulic motor M1 and the propulsion driving member hydraulic motor M2 are respectively driven in the rotation directions corresponding to the propulsion direction of the propulsion head 5. It has become. Further, the control unit 7 controls the rotation of the hydraulic motor M2 for the propulsion drive member so that a constant propulsion speed is obtained by the signal from the pressure sensor 12, and furthermore, the propulsion head according to the signal from the position sensor 15. The control relating to the propulsion direction of the screw auger 4 included in 8 is performed. In the direction control of the screw auger 4 in the present embodiment, an injection nozzle (member indicated by reference numeral 4A in FIG. 2) capable of jetting bentonite mud is provided at the tip of the screw auger 4, and the injection angle of the injection nozzle 4A is appropriately selected. Thus, the soil is softened, and the screw auger 4 is easily propelled in the softened direction. For this reason, a bentonite muddy water supply unit 4B for setting the injection conditions of bentonite muddy water is connected to the output unit of the control unit 7. In addition, the injection nozzle 4A is
It is connected to a double pipe that does not interfere with the rotation of the screw auger 4, and has a structure in which the injection angle can be changed by rotating the double pipe in the circumferential direction.

In this embodiment, the supply pipe 1 is laid by the following procedure using the excavation propulsion device 3 having the above-described configuration.
FIG. 4 is a flowchart illustrating the operation of the control unit 7 when the procedure described below is executed. (1) First, when the supply pipe 1 is newly established, the propulsion machine base 3A of the excavation propulsion device 3 is installed near the meter standing pipe to prepare for excavation. The preparation is performed by feeding out one end of the supply pipe 1 worn on the reel, inserting the supply pipe 1 between the propulsion driving members 6 provided on the propulsion machine base 3A, and then using the chuck 8 provided at the rear of the propulsion head 8. Propulsion head 5 at one end
Integrate with When the supply pipe 1 is inserted into the propulsion driving member 6, the angle of entry of the screw auger 4 into the ground is changed by the command output from the control unit 7 to the cylinder 3D to the swing angle corresponding to the amount of extension of the cylinder 3D. Is set to In this case, the swing angle, in other words, the entry angle of the screw auger 4 is determined by the distance between the position of the meter standing pipe and the position of the main pipe 2 and the buried depth which is not damaged by the influence of the pressure from the ground. When the distance between the main pipe 2 and the meter standpipe is short and the burial depth is somewhat deep, the angle is close to 90 degrees, and when the distance is long, the angle is close to horizontal. You. As shown by reference numerals S1 to S3 in FIG. 4, the control unit 7 controls the propulsion drive member 3B to set the opposing interval of the propulsion drive member 3B to the clamping interval of the supply pipe 1 in response to the operation of the caliber set key 13. Cylinder D1 is driven.

(2) When the preparation is completed, the propulsion head 4 is propelled toward the ground by operating the start switch 11, and the excavation by the screw auger 4 is started. In this case, when the start switch 11 is operated, the control unit 7 controls the screw auger hydraulic motor M1 as shown by reference numerals S4 and S5 in FIG.
The rotation of the propulsion drive member hydraulic motor M2 is controlled, and the supply pipe 1 is extended in the propulsion direction by torque transmission via frictional contact between the propulsion drive member 6 and the supply pipe 1. The feed pipe 1 integrated with the propulsion head 5 is drawn in while traveling inside. When the propulsion head 5 advances, reference numeral S6 in FIG.
And S7, the reaction force from the soil acting on the screw auger 4 is detected by the distortion of the screw auger 4 via the pressure sensor 12, and the operating condition of the hydraulic motor M2 is changed according to the amount of the distortion. . Thus, the opposing distance of the propulsion drive member 6 is adjusted and the frictional contact force is changed, so that the propulsion drive member 6 can receive the propulsion drive member 6. Can be promoted.

(3) Screw auger 4 for excavating underground
The control unit 7 controls the propulsion direction and the propulsion force based on signals from the pressure sensor 12 and the position sensor 15 to form a propulsion hole in the ground, and at the same time, pulls the supply pipe 1 to reach the arrival shaft A ( (See FIG. 1).
In this case, as shown by reference numerals S8 and S9 in addition to the processes of the above reference numerals S6 and S7 in FIG. The adjustment of the opposing distance of the propulsion driving member 6 described above is executed by the signal of (1).

(4) When the propulsion head 8 reaches the arrival height A, the supply pipe 1 is removed from the propulsion head 8, and only the hydraulic pipes 10, 10 'are collected. In this case,
As shown by reference numeral S10 in FIG. 4, the control unit 7 determines whether or not a reaction force from the soil is acting on the pressure sensor 12, and when the reaction force is not acting, the arrival counter A Is determined to have been reached. The pressure sensor 12
When the reaction force from the soil is detected by the
In the middle, the processes indicated by reference numerals S6 to S10 are continued.

When the propulsion head 5 arrives at the arrival stand A, the propulsion drive member 6 provided in the supply pipe feed portion 3C of the propulsion machine base 3A is separated from the propulsion drive member 6 by a distance between the propulsion drive member 6 and the supply pipe 1. Of the oil supply unit 9
When the oil in the pipes 10 and 10 ′ and other hydraulic pipes is recovered, the pipes 10 and 10 ′ are pulled out of the supply pipe 1. The propulsion head 5 includes the pipe 1
When 0 and 10 'are removed, the supply pipe 1
Can be removed, so that the supply pipe 1 is newly installed without cutting the ground.

According to the above-described embodiment, since the supply pipe 1 is used as a conventional excavating rod, it is not necessary to perform an excavating process when collecting the excavating rod as in the related art. In addition, it is possible to eliminate the adverse effect on the environment preservation due to the above and to eliminate the time required for the earth removal processing, thereby shortening the working time. Also, since the supply pipe 1 can be used as a propulsion rod instead of using a rod,
Compared to the conventional working time, the time required for adding rods and collecting work can be reduced to about half as much as the conventional working time.

[0026]

As is apparent from the above description, according to the first aspect of the present invention, one end of a PE pipe corresponding to a new pipe material worn on the ground is integrated with the propulsion head. Since the propulsion is driven, the PE tube can function as a propulsion rod of the propulsion head. As a result, the propulsion head can be propelled by the PE pipe that is sequentially fed from the wear position, so that the excavation can be performed in conjunction with the propulsion of the propulsion head without performing the work of adding and collecting rods, which was conventionally performed. At the same time, the PE tube can be pulled in.

According to the second aspect of the present invention, since the reaction force from the soil generated when the propulsion head is propelled is received by the feeding roller for feeding a new pipe material, the PE is received.
When the pipe is used as a propulsion rod, return can be suppressed and the propulsion operation by the excavation means can be performed smoothly.

According to the third aspect of the present invention, the angle of the base provided with the feed-out roller can be adjusted from a state parallel to the ground to a right angle on the road surface or the ground in the private area, so that the main pipe can be directly connected from the ground. The PE pipe can be advanced at an angle toward, and the PE pipe can be laid without cutting the ground.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a laid state of a supply pipe corresponding to a new pipe material according to an embodiment of the present invention.

FIG. 2 is a perspective view for explaining a configuration of an excavation propulsion device used when laying a new pipe shown in FIG.

FIG. 3 is a block diagram for explaining a configuration of a control unit used when laying a new pipe shown in FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the control unit shown in FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 supply pipe using PE pipe corresponding to new pipe material 2 main pipes 3 excavation propulsion device 3C supply pipe feed section 4 screw auger corresponding to excavation means 5 propulsion head 6 propulsion drive member 7 control section A arrival counter

Claims (3)

[Claims] 1. A pipe laying method in which a digging means is propelled from the ground surface to the ground, and a PE pipe corresponding to a new pipe material is inserted into a propulsion hole formed by the digging means. One end of the PE pipe worn on the ground is integrated with the propulsion head equipped with the source behind the excavation means, and the propulsion drive is performed while holding a part of the PE pipe, whereby the excavation means is provided. A pipe laying method characterized in that the PE pipe is drawn into the ground at the same time as the propulsion. 2. The pipe laying method according to claim 1, wherein the PE pipe is gripped by a rotatable pay-out roller provided on a base installed in a stationary state, and the pay-out roller moves in the propulsion direction. A pipe laying method characterized in that a propulsion reaction force from the soil acting on the excavation means is received and propelled by rotating in a direction as described above. 3. The pipe laying method according to claim 2, wherein the base provided with the feed-out roller is installed on a road surface or on the ground in a private area, and at a place where the base is installed, the base is changed from a state parallel to the ground to a right angle. A pipe laying method, characterized in that the propulsion angle of the new pipe can be adjusted.